security blanket vs thing

security blanket and thing both are nouns.

Word	Noun	Adjective	Verb	Adverb
security blanket	Yes	No	No	No
thing	Yes	No	No	No

As nouns, thing is a hypernym of security blanket; that is, thing is a word with a broader meaning than security blanket:

security blanket (noun)	thing (noun)
a blanket (or toy) that a child carries around in order to reduce anxiety	a separate and self-contained entity
anything that an adult person uses to reduce anxiety	an action
	an artifact
	an entity that is not named specifically
	any attribute or quality considered as having its own existence
	a special abstraction
	a special objective
	a vaguely specified concern
	a statement regarded as an object
	an event
	a persistent illogical feeling of desire or aversion
	a special situation