dipsomaniac vs alky

dipsomaniac and alky both are nouns.

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

As nouns, dipsomaniac and alky are synonyms defined as:

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

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