modus operandi vs rut

modus operandi and rut both are nouns.

Word	Noun	Adjective	Verb	Adverb
modus operandi	Yes	No	No	No
rut	Yes	No	Yes	No

As nouns, rut is a hyponym of modus operandi; that is, rut is a word with a more specific, narrower meaning than modus operandi:

Other hyponyms of modus operandi include rat race, groove.

modus operandi (noun)	rut (noun)
an unvarying or habitual method or procedure	a settled and monotonous routine that is hard to escape
	a groove or furrow (especially one in soft earth caused by wheels)
	applies to nonhuman mammals: a state or period of heightened sexual arousal and activity

modus operandi (verb)	rut (verb)
	hollow out in the form of a furrow or groove
	be in a state of sexual excitement; of male mammals