habit vs drug abuse

habit and drug abuse both are nouns.

Word	Noun	Adjective	Verb	Adverb
habit	Yes	No	Yes	No
drug abuse	Yes	No	No	No

As nouns, habit and drug abuse are synonyms defined as:

Other synonyms of habit include substance abuse.

habit (noun)	drug abuse (noun)
excessive use of drugs	excessive use of drugs
(psychology) an automatic pattern of behavior in reaction to a specific situation; may be inherited or acquired through frequent repetition
a distinctive attire worn by a member of a religious order
attire that is typically worn by a horseback rider (especially a woman's attire)
an established custom
the general form or mode of growth (especially of a plant or crystal)

habit (verb)	drug abuse (verb)
put a habit on