preferred vs pet

preferred is not a noun while pet is a noun.

Word	Noun	Adjective	Verb	Adverb
preferred	No	Yes	No	No
pet	Yes	Yes	Yes	No

As adjectives, preferred and pet are synonyms defined as:

preferred and pet: preferred above all others and treated with partiality

Other synonyms of preferred include best-loved, favored, favorite, favoured, favourite, preferent.

preferred (noun)	pet (noun)
	a domesticated animal kept for companionship or amusement
	a fit of petulance or sulkiness (especially at what is felt to be a slight)
	a special loved one

preferred (adjective)	pet (adjective)
more desirable than another	preferred above all others and treated with partiality
preferred above all others and treated with partiality

preferred (verb)	pet (verb)
	stroke or caress gently
	stroke or caress in an erotic manner, as during lovemaking