drift apart vs alienate

drift apart and alienate both are verbs.

Word	Noun	Adjective	Verb	Adverb
drift apart	No	No	Yes	No
alienate	No	No	Yes	No

As verbs, alienate is a hypernym of drift apart; that is, alienate is a word with a broader meaning than drift apart:

drift apart: lose personal contact over time
alienate: arouse hostility or indifference in where there had formerly been love, affection, or friendliness

Other hypernyms of drift apart include disaffect, estrange.

drift apart (verb)	alienate (verb)
lose personal contact over time	arouse hostility or indifference in where there had formerly been love, affection, or friendliness
	make withdrawn or isolated or emotionally dissociated
	transfer property or ownership