bach vs bachelor

bach is not a noun while bachelor is a noun.

Word	Noun	Adjective	Verb	Adverb
bach	No	No	Yes	No
bachelor	Yes	No	Yes	No

As verbs, bach and bachelor are synonyms defined as:

bach (noun)	bachelor (noun)
	a man who has never been married
	a knight of the lowest order; could display only a pennon

bach (verb)	bachelor (verb)
lead a bachelor's existence	lead a bachelor's existence