pacifier

nouns

someone who tries to bring peace
conciliator, make-peace, pacifier, peacemaker, reconciler
is derived from
pacify
anything that serves to pacify
pacifier
is a type of (narrower)
an entity that is not named specifically
"I couldn't tell what the thing was"
thing
device used for an infant to suck or bite on
baby's dummy, comforter, pacifier, teething ring
is derived from
pacify