A noun is a name of a person, animals, places, or things. In the above sentence James is a name of a person.
Pronouns is used instead of a noun. Examples are: He, she, her etc... In the sentence above 'Her' is a pronoun.
Verbs are actions words or doing words. They tells the action in a sentence. A verb is use in the sentence above 'Is' is a verb.
Adverb modifies or describes a verb, adjective or an adverb in a sentence. An example of an adverb is 'Taller' as used in the above sentence. It modifies the verb 'Is'.
Conjunctions are words than join two or more sentence together. Examples are: Than, but, and, not etc....