buy the farm vs leave

buy the farm is not a noun while leave is a noun.

Word	Noun	Adjective	Verb	Adverb
buy the farm	No	No	Yes	No
leave	Yes	No	Yes	No

buy the farm (noun)	leave (noun)
	the act of departing politely
	permission to do something
	the period of time during which you are absent from work or duty

buy the farm (verb)	leave (verb)
pass from physical life and lose all bodily attributes and functions necessary to sustain life	leave unchanged or undisturbed or refrain from taking
	be survived by after one's death
	leave behind unintentionally
	go and leave behind, either intentionally or by neglect or forgetfulness
	move out of or depart from
	go away from a place
	leave or give by will after one's death
	transmit (knowledge or skills)
	put into the care or protection of someone
	remove oneself from an association with or participation in
	produce as a result or residue
	make a possibility or provide opportunity for; permit to be attainable or cause to remain
	act or be so as to become in a specified state
	have left or have as a remainder