founder vs fall in

founder is a noun but fall in is not a noun.

Word	Noun	Adjective	Verb	Adverb
founder	Yes	No	Yes	No
fall in	No	No	Yes	No

As verbs, founder and fall in are synonyms defined as:

Other synonyms of founder include break, cave in, collapse, give, give way.

founder (noun)	fall in (noun)
a person who founds or establishes some institution
a worker who makes metal castings
inflammation of the laminated tissue that attaches the hoof to the foot of a horse

founder (verb)	fall in (verb)
break down, literally or metaphorically	break down, literally or metaphorically
sink below the surface	become part of; become a member of a group or organization
stumble and nearly fall	to take one's place in a military formation or line
fail utterly; collapse