In the sentence "Some buildings have separate classrooms," the word "separate" is used as an adjective to describe the classrooms.
"City state" is a noun. It refers to a city that is also a separate sovereign state or political entity.
Boulevard is a noun. It refers to a wide street in a city or town, often lined with trees or buildings.
The part of speech for "answer" is a noun.
The part of speech for this particular word is a noun.
The body
adjective
"Classrooms" is a plural noun.
The word separate is a verb. The past tense is separated.
"City state" is a noun. It refers to a city that is also a separate sovereign state or political entity.
A corner kick (two separate words) is a noun. It is a term used in football (soccer).
Boulevard is a noun. It refers to a wide street in a city or town, often lined with trees or buildings.
They are identical. (Edit: The twin towers were two buildings: WTC 1 and WTC 2. The World Trade Center was actually a complex of buildings, rather than simply one. I believe there were seven buildings that were a part of the complex, but none of them were quite as prominent as the twin towers. )
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