The word 'bird' is singular.
The word 'birds' is plural.
"One bird, two or more birds."
The collective noun for a group of birds is a flock: "I saw a large flock of geese on the riverbank."
The word bird is the singular form of the plural noun birds.
The noun 'birds' is plural, a word for two or more creatures.one birdmany birds
The plural form for the demonstrative pronoun this is these.
The plural form is squirrels; the plural possessive form is squirrels'.
The plural form of the word inferno is infernos.
The plural form is ranches.
There is no plural form for the word, countries. This word itself is a plural.
There is no plural word for if.
The plural form is data.
The plural form of the word "baby" is "babies."
The plural form for the word 'pioneer' is pioneers.
The plural form of the word "pharynx" is "pharynges."