retain vs sustain

sustain vs retain

retain and sustain both are verbs.

Word	Noun	Adjective	Verb	Adverb
retain	No	No	Yes	No
sustain	No	No	Yes	No

As verbs, sustain is a hypernym of retain; that is, sustain is a word with a broader meaning than retain:

retain: allow to remain in a place or position or maintain a property or feature
sustain: lengthen or extend in duration or space

Other hypernyms of retain include keep up, prolong.

retain (verb)	sustain (verb)
keep in one's mind	undergo (as of injuries and illnesses)
secure and keep for possible future use or application	establish or strengthen as with new evidence or facts
allow to remain in a place or position or maintain a property or feature	admit as valid
hold back within	supply with necessities and support
	provide with nourishment
	be the physical support of; carry the weight of
	lengthen or extend in duration or space

Difference between retain and sustain

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