precipitant vs overhasty

precipitant is a noun but overhasty is not a noun.

Word	Noun	Adjective	Verb	Adverb
precipitant	Yes	Yes	No	No
overhasty	No	Yes	No	No

As adjectives, precipitant and overhasty are synonyms defined as:

precipitant and overhasty: done with very great haste and without due deliberation

Other synonyms of precipitant include hasty, precipitate, precipitous.

precipitant (noun)	overhasty (noun)
an agent that causes a precipitate to form

precipitant (adjective)	overhasty (adjective)
done with very great haste and without due deliberation	done with very great haste and without due deliberation