alky vs dipsomaniac

alky and dipsomaniac both are nouns.

Word	Noun	Adjective	Verb	Adverb
alky	Yes	No	No	No
dipsomaniac	Yes	No	No	No

As nouns, alky and dipsomaniac are synonyms defined as:

Other synonyms of alky include alcoholic, boozer, lush, soaker, souse.

alky (noun)	dipsomaniac (noun)
a person who drinks alcohol to excess habitually	a person who drinks alcohol to excess habitually