put vs put to sleep

put is a noun but put to sleep is not a noun.

Word	Noun	Adjective	Verb	Adverb
put	Yes	No	Yes	No
put to sleep	No	No	Yes	No

As verbs, put to sleep is a hyponym of put; that is, put to sleep is a word with a more specific, narrower meaning than put:

put (noun)	put to sleep (noun)
the option to sell a given stock (or stock index or commodity future) at a given price before a given date

put (verb)	put to sleep (verb)
arrange thoughts, ideas, temporal events	kill gently, as with an injection
estimate	help someone go to bed
formulate in a particular style or language
attribute or give
put into a certain place or abstract location
cause to be in a certain state; cause to be in a certain relation
adapt
cause (someone) to undergo something
make an investment