pet vs favoured

pet is a noun but favoured is not a noun.

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

As adjectives, pet and favoured are synonyms defined as:

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

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

pet (noun)	favoured (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

pet (adjective)	favoured (adjective)
preferred above all others and treated with partiality	preferred above all others and treated with partiality

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