practice vs custom

practice and custom both are nouns.

Word	Noun	Adjective	Verb	Adverb
practice	Yes	No	Yes	No
custom	Yes	Yes	No	No

As nouns, custom is a hyponym of practice; that is, custom is a word with a more specific, narrower meaning than practice:

As nouns, custom is a hyponym of practice; that is, custom is a word with a more specific, narrower meaning than practice:

Other hyponyms of practice include tradition, convention, formula, normal, pattern, rule, heritage.

practice (noun)	custom (noun)
a customary way of operation or behavior	accepted or habitual practice
systematic training by multiple repetitions	habitual patronage
the exercise of a profession	a specific practice of long standing
translating an idea into action	money collected under a tariff
knowledge of how something is usually done

practice (adjective)	custom (adjective)
	made according to the specifications of an individual

practice (verb)	custom (verb)
learn by repetition
engage in a rehearsal (of)
carry out or practice; as of jobs and professions
avail oneself to
engage in or perform