fast vs refrain

fast and refrain both are nouns.

Word	Noun	Adjective	Verb	Adverb
fast	Yes	Yes	Yes	Yes
refrain	Yes	No	Yes	No

As verbs, refrain is a hypernym of fast; that is, refrain is a word with a broader meaning than fast:

Other hypernyms of fast include abstain, desist.

As verbs, refrain is a hypernym of fast; that is, refrain is a word with a broader meaning than fast:

Other hypernyms of fast include abstain, desist.

fast (noun)	refrain (noun)
abstaining from food	the part of a song where a soloist is joined by a group of singers

fast (adjective)	refrain (adjective)
acting or moving or capable of acting or moving quickly
at a rapid tempo
(used of timepieces) indicating a time ahead of or later than the correct time
(of a photographic lens or emulsion) causing a shortening of exposure time
unwavering in devotion to friend or vow or cause
securely fixed in place
hurried and brief
unrestrained by convention or morality
resistant to destruction or fading
(of surfaces) conducive to rapid speeds

fast (verb)	refrain (verb)
abstain from eating	choose not to consume
abstain from certain foods, as for religious or medical reasons	resist doing something

fast (adverb)	refrain (adverb)
quickly or rapidly (often used as a combining form)
firmly or closely