generally vs mostly

generally and mostly both are adverbs.

Word	Noun	Adjective	Verb	Adverb
generally	No	No	No	Yes
mostly	No	No	No	Yes

As adverbs, generally and mostly are synonyms defined as:

Other synonyms of generally include by and large, more often than not.

generally (adverb)	mostly (adverb)
without regard to specific details or exceptions	in large part; mainly or chiefly
without distinction of one from others	usually; as a rule
usually; as a rule