Promiser

prom·ise  (prms)

n.

1.

a. A declaration assuring that one will or will not do something; a vow.

b. Something promised.

2. Indication of something favorable to come; expectation: a promise of spring in the air.

3. Indication of future excellence or success: a player of great promise.

v. prom·ised, prom·is·ing, prom·is·es

v.tr.

1. To commit oneself by a promise to do or give; pledge: left but promised to return.

2. To afford a basis for expecting: thunderclouds that promise rain.

v.intr.

1. To make a declaration assuring that something will or will not be done.

2. To afford a basis for expectation: an enterprise that promises well.

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[Middle English promis, from Old French promise, from Medieval Latin prmissa, alteration of Latin prmissum, from neuter past participle of prmittere, to send forth, promise : pr-, forth; see pro-¹ + mittere, to send.]

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promis·er n.

Synonyms: promise, pledge, swear, vow¹
These verbs mean to declare solemnly that one will follow a particular course of action: promises to write soon; pledged to uphold the law; swore to get revenge; vowed to fight to the finish.

Thesaurus

Noun

1.

promiser - a person who makes a promise promisor communicator - a person who communicates with others vower - someone who makes a solemn promise to do something or behave in a certain way; "young vowers of eternal love"; "there are many vowers of chastity but few who observe it"