Nouns or pronouns.
part of speech
Adjective
What part of speech is thaw
Normally it's a verb (as in "I let him do it") but it can be a noun (as in "I rented the house on a short let").
The part of speech for oscillate is verb.
All subjects are part of speech for they are all nouns.
Verbs need subjects, which can be nouns or pronouns.
Enables is a present tense verb. It's used with third person singular subjects.
The word "curriculum" is a noun. It refers to the subjects and content taught in a school, course, or educational program.
The word 'excelled' is the past tense of the verb to excel.Example: Jeff did well in all of his subjects but he excelled in math.
A conjunction joins anything that is compound Conjunctions: and but or yet nor either+ or neither+nor
Without providing more information (subjects in school, subjects of a kingdom, subjects as parts of speech etc.), subjects also fit into catagories.
metaphor
And is a conjunction. In the sentence "Ramesh and Suresh are good friends" and connects the two subjects, Ramesh and Suresh, to make a compound subject.
part of speech
The part of speech for this particular word is a noun.
The part of speech for "answer" is a noun.