Swell can be a noun, adjective and verb.
Noun: A long series of ocean waves.
Adjective: Excellent, great.
Verb: To increase in size.
Normally red, swelled & bloodshot eyes, stuttering of speech, lack of concentration.
swelled My toe swelled up last night.
part of speech
The part of speech for this particular word is a noun.
The part of speech for "answer" is a noun.
adverb
what part of speech is beneath
The present perfect tense of "swell" is "has swelled" or "have swelled," depending on the subject of the sentence. For example, "The river has swelled after heavy rains."
The part of speech for "explicit" is an adjective.
The part of speech for "twirl" is a verb.
The part of speech for "unfamiliar" is an adjective.
The part of speech for "lecturer" is a noun.