roost vs steady down

roost is a noun but steady down is not a noun.

Word	Noun	Adjective	Verb	Adverb
roost	Yes	No	Yes	No
steady down	No	No	Yes	No

As verbs, steady down is a hypernym of roost; that is, steady down is a word with a broader meaning than roost:

roost: settle down or stay, as if on a roost
steady down: become settled or established and stable in one's residence or life style

Other hypernyms of roost include root, settle, settle down, take root.

roost (noun)	steady down (noun)
a perch on which domestic fowl rest or sleep
a shelter with perches for fowl or other birds

roost (verb)	steady down (verb)
settle down or stay, as if on a roost	become settled or established and stable in one's residence or life style
sit, as on a branch