precipitant vs precipitous

precipitant is a noun but precipitous is not a noun.

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

As adjectives, precipitant and precipitous are synonyms defined as:

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

Other synonyms of precipitant include hasty, overhasty, precipitate.

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

precipitant (adjective)	precipitous (adjective)
done with very great haste and without due deliberation	done with very great haste and without due deliberation
	dangerously steep