keep vs keep out

keep is a noun but keep out is not a noun.

Word	Noun	Adjective	Verb	Adverb
keep	Yes	No	Yes	No
keep out	No	No	Yes	No

As verbs, keep out is a hyponym of keep; that is, keep out is a word with a more specific, narrower meaning than keep:

keep: stop (someone or something) from doing something or being in a certain state
keep out: prevent from entering; shut out

keep (noun)	keep out (noun)
the main tower within the walls of a medieval castle or fortress
a cell in a jail or prison
the financial means whereby one lives

keep (verb)	keep out (verb)
prevent (food) from rotting	remain outside
prevent the action or expression of	prevent from entering; shut out
stick to correctly or closely
maintain by writing regular records
supply with necessities and support
hold and prevent from leaving
retain possession of
look after; be the keeper of; have charge of
retain rights to
maintain for use and service
have as a supply
store or keep customarily
stop (someone or something) from doing something or being in a certain state
allow to remain in a place or position or maintain a property or feature
conform one's action or practice to
behave as expected during of holidays or rites
cause to continue in a certain state, position, or activity
supply with room and board
maintain in safety from injury, harm, or danger
fail to spoil or rot
continue a certain state, condition, or activity
to rear