A fish is a noun. To fish is a verb.
And is a conjunction.
The word fishing is a verb. It is the present participle of the verb fish.
In that sentence your is an adjective, or a possessive pronominal adjective.
Tuna is a noun. Nouns are the names of / places / things. Tuna is a thing (fish).
The word "species" is a noun. Here is an example of its usage in a sentence: There are over 28,000 species of fish on the planet.
Large is an adjective. In this sentence it is describing the noun fish and is part of the subject (large fish) of the sentence.
The part of speech for "answer" is a noun.
part of speech
The part of speech for this particular word is a noun.
what part of speech is beneath
adverb
what part of speech is work