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No, not an irregular plural. Like the noun fish, the noun swordfish is both a count and a non-count noun, depending on use.
The noun fish (and swordfish) is a non-count noun as a word for a substance, a food.
The noun fish (and swordfish) is a count noun for a creature living is the sea (or fresh water if applicable).
A regular plural is a noun that forms the plural by adding -s or -es to the end of the word. An irregular plural is a noun that forms the plural in some other way (child, children; foot, feet; man, men; etc.)
The noun fish (and swordfish) forms the plural, fishes (and swordfishes) by adding -es to the end of the word; a regular plural.
Example use for count and non-count:
Our group caught three swordfishes.
We have enough swordfish to feed the whole neighborhood.
What else can I help you with?
What is the plural form of swordfish?
swordfishes
What is the plural form of do and don't in a sentence?
There is no plural form. Do and Do not are verbs
How do you spell the plural form of him?
The plural form of him, her, or it is them. (objective pronouns)
Plural form of bridge?
Bridges is the plural form of bridge.
What is the plural form of was?
The plural form of "was" is "were."
What is the plural form of I?
The plural form of "I" is "we."
What is plural form of is?
The plural form of "is" is "are."
Plural form of mounth?
The plural form of mouth is mouths. The plural form of month is months. The Mounth is a range of hills in Scotland and does not have a plural form.
Is or are groceries a plural or singular?
"Groceries" is the plural form of "grocery."
What is the plural form for beliefs?
"Beliefs" does not have a plural form, as it is already plural. Beliefs is the plural form of belief.
What is the plural form of that?
The plural form of the demonstrative pronoun 'that' is those.
What is the plural form of trench?
Trenches is the plural form.
