"Little" is an adjective, describing the boy. "Boy" is a noun, referring to a young male.
"Lesser" can function as an adjective or as a comparative form of the adjective "little."
"Perfunctory" is an adjective. It describes an action that is done with little interest or enthusiasm.
The part of speech for this particular word is a noun.
The part of speech for "answer" is a noun.
The part of speech for "explicit" is an adjective.
The word "boy" is a noun. A boy is a person.
Boys is a noun. It's the plural form of boy.
Adjective
It's a pronoun.
El Niño is a noun. It is derived from Spanish meaning "the little boy". In Spanish it is a proper noun used to refer to Jesus.
the subject
PREPOSITION
Brother is a noun.
An adverb modifying the adjective "little"
The little drummer boy is fictitious so is not a part of the Biblical Christmas story.
third person singular verb
Daniel Radcliffe played the little boy Harry Potter in all the series movies