The part of speech that connects words and sentences is called a conjunction.
In America it is quite common to treat articles (the, a, an) as a part of speech.
Verb
Conjunctions are parts of speech that are used to join words, phrases, or clauses together. They help establish relationships between the words or groups of words in a sentence. Some common conjunctions include "and," "but," and "or."
"Teaches" is a verb. "Which" is a pronoun. which part of speech is become
The words 'rotor' and 'propeller' are nouns, singular, common, concrete nouns; word for things.
'His' and 'he' are pronouns
Seat belt is a noun, when the words are used together to describe the common automobile safety feature.
Suffixes are parts of words, therefore they are not parts of speech. Parts of speech are full words like LOGICAL - CAL is a part of that word that is an adjective.
It is a common noun.
Common noun
common noun