peer vs life peer

peer and life peer both are nouns.

Word	Noun	Adjective	Verb	Adverb
peer	Yes	No	Yes	No
life peer	Yes	No	No	No

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

peer: a nobleman (duke or marquis or earl or viscount or baron) who is a member of the British peerage
life peer: a British peer whose title lapses at death

Other hyponyms of peer include baron, duke, earl, Earl Marshal, marquess, peer of the realm, viscount, viscountess.

peer (noun)	life peer (noun)
a person who is of equal standing with another in a group	a British peer whose title lapses at death
a nobleman (duke or marquis or earl or viscount or baron) who is a member of the British peerage

peer (verb)	life peer (verb)
look searchingly