The word might've is not actually in most dictionaries but has become quite common to use as an informal contraction of the words 'might have'. Both 'might' and 'have' are auxiliary verbs (the past tense or conditional form of 'may have').
The contraction might've functions as a combined auxiliary verb.
Example:
We might have been late but we did show up.
OR:
We might've been late but we did show up.
Note: The contraction might've used as a verb or auxiliary verb is recommend for personal writing only, not for school or business.
The part of speech for this particular word is a noun.
The part of speech that the word my is used as is an adjective.
H is a letter, not a word. To be a part of speech, it needs to be a word.
The part of speech for the word civilian is English grammar.
The part of speech for the word diplomacy is a noun.
The word speech is a noun.
The part of speech for this particular word is a noun.
The word speech is a noun.
The word speech is a noun.
The word speech is a noun.
What "part of speech" is the word "said?"
A suffix changes a word's part of speech. For example, the word 'happy' is an adjective. But when you add a suffix, which is an ending, it can change the part of speech. Happily is an adverb. Happiness is a noun.