leave alone vs leave behind

leave alone and leave behind both are verbs.

Word	Noun	Adjective	Verb	Adverb
leave alone	No	No	Yes	No
leave behind	No	No	Yes	No

As verbs, leave alone and leave behind are synonyms defined as:

leave alone and leave behind: leave unchanged or undisturbed or refrain from taking

Other synonyms of leave alone include leave, let alone.

leave alone (verb)	leave behind (verb)
leave unchanged or undisturbed or refrain from taking	be survived by after one's death
	leave unchanged or undisturbed or refrain from taking
	depart and not take along