Both comprehension and understanding can be used to talk about someone's ability to understand something.
If you have an understanding of something, you have some knowledge of it, or you know how it works or what it means.
You cannot use comprehension with this meaning.
Understanding has another meaning. If there is understanding between people, they are friendly towards each other and trust each other.
Noun | 1. | ![]() knowing - a clear and certain mental apprehension comprehension - an ability to understand the meaning or importance of something (or the knowledge acquired as a result); "how you can do that is beyond my comprehension"; "he was famous for his comprehension of American literature" self-knowledge - an understanding of yourself and your goals and abilities smattering - a slight or superficial understanding of a subject appreciation, grasp, hold - understanding of the nature or meaning or quality or magnitude of something; "he has a good grasp of accounting practices" grasping - understanding with difficulty; "the lecture was beyond his most strenuous graspings" hindsight - understanding the nature of an event after it has happened; "hindsight is always better than foresight" realization, realisation, recognition - coming to understand something clearly and distinctly; "a growing realization of the risk involved"; "a sudden recognition of the problem he faced"; "increasing recognition that diabetes frequently coexists with other chronic diseases" |
2. | ![]() conspiracy, confederacy - a secret agreement between two or more people to perform an unlawful act fair-trade agreement - an agreement (illegal in the United States) between the manufacturer of a trademarked item of merchandise and its retail distributors to sell the item at a price at or above the price set by the manufacturer covenant - (Bible) an agreement between God and his people in which God makes certain promises and requires certain behavior from them in return unilateral contract - a one-sided agreement whereby you promise to do (or refrain from doing) something in return for a performance (not a promise) sales agreement, sale - an agreement (or contract) in which property is transferred from the seller (vendor) to the buyer (vendee) for a fixed price in money (paid or agreed to be paid by the buyer); "the salesman faxed the sales agreement to his home office" statement - a message that is stated or declared; a communication (oral or written) setting forth particulars or facts etc; "according to his statement he was in London on that day" term, condition - (usually plural) a statement of what is required as part of an agreement; "the contract set out the conditions of the lease"; "the terms of the treaty were generous" bargain, deal - an agreement between parties (usually arrived at after discussion) fixing obligations of each; "he made a bargain with the devil"; "he rose to prominence through a series of shady deals" working agreement - an informal agreement to work together gentlemen's agreement - a personal agreement based on honor and not legally binding written agreement - a legal document summarizing the agreement between parties submission - an agreement between parties in a dispute to abide by the decision of an arbiter entente, entente cordiale - a friendly understanding between political powers oral contract - an agreement that is not in writing and is not signed by the parties but is a real existing contract that lacks only the formal requirement of a memorandum to render it enforceable in litigation reservation - the written record or promise of an arrangement by which accommodations are secured in advance settlement - a conclusive resolution of a matter and disposition of it severance agreement - an agreement on the terms on which an employee will leave suicide pact - an agreement by two or more people to commit suicide together at a given place and time; "the two lovers killed themselves in a suicide pact" | |
3. | ![]() inclination, tendency, disposition - an attitude of mind especially one that favors one alternative over others; "he had an inclination to give up too easily"; "a tendency to be too strict" | |
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Adj. | 1. | ![]() perceptive - having the ability to perceive or understand; keen in discernment; "a perceptive eye"; "a perceptive observation" |