fall in vs founder

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

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

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

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

fall in (noun)	founder (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

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