functionword

As a noun argument is

proof, reason, point.

As an adjective primary is

the first in a group or series.

As a noun primary is

a primary election; a preliminary election to select a political candidate of a political party.

As a verb primary is

(us|intransitive) to take part in a primary election.

Functionword is likely misspelled.

Functionword has no English definition.

As an adjective irreducible is

not able to be reduced or lessened.

As a noun irreducible is

such a polynomial.