sit vs pose

sit is not a noun while pose is a noun.

Word	Noun	Adjective	Verb	Adverb
sit	No	No	Yes	No
pose	Yes	No	Yes	No

As verbs, pose is a hypernym of sit; that is, pose is a word with a broader meaning than sit:

Other hypernyms of sit include lay, place, position, put, set.

As verbs, sit and pose are synonyms defined as:

Other synonyms of sit include model, posture.

sit (noun)	pose (noun)
	a deliberate pretense or exaggerated display
	affected manners intended to impress others
	a posture assumed by models for photographic or artistic purposes

sit (verb)	pose (verb)
serve in a specific professional capacity	be a mystery or bewildering to
be in a position in which one's upper body is largely upright and supported by one's backside	pretend to be someone you are not; sometimes with fraudulent intentions
show to a seat; assign a seat for	put into a certain place or abstract location
take a seat	assume a posture as for artistic purposes
be in session	behave affectedly or unnaturally in order to impress others
sit and travel on the back of animal, usually while controlling its motions	offer for others to consider
assume a posture as for artistic purposes
work or act as a baby-sitter
be around, often idly or without specific purpose
be located or situated somewhere