Altered is a past tense verb.
The word "deformed" is an adjective. It describes something that has been altered or disfigured in shape.
The part of speech for "answer" is a noun.
part of speech
The part of speech for this particular word is a noun.
adverb
what part of speech is work
what part of speech is beneath
The word "oxygen" is a noun, a common, concrete, uncountable noun; a word for an element, a word for a thing. It can be altered into a verb as in "oxygenate".
The part of speech for "indefinite" is an adjective.
The part of speech for "buried" is a verb.
The part of speech for "rapid" is an adjective.
The part of speech for "twirl" is a verb.