explainer

1. (agent, form-of) Agent noun of explain; one who explains.
2. A guide that explains a topic.

explain

1. (transitive) To make plain, manifest, or intelligible; to clear of obscurity; to illustrate the meaning of.
2. (transitive) To give the reason for, justification for, or cause of.
3. (obsolete) To make flat, smooth out.
4. (obsolete) To unfold or make visible.
5. (intransitive) To make something plain or intelligible.

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Etymology

From explain + -er.

Synonyms

commentator

exponent

expounder

interpreter

explicator