thing vs pacifier

thing and pacifier both are nouns.

Word	Noun	Adjective	Verb	Adverb
thing	Yes	No	No	No
pacifier	Yes	No	No	No

As nouns, pacifier is a hyponym of thing; that is, pacifier is a word with a more specific, narrower meaning than thing:

thing (noun)	pacifier (noun)
a separate and self-contained entity	device used for an infant to suck or bite on
an action	anything that serves to pacify
an artifact	someone who tries to bring peace
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