According to Oxford Dictionary On-line the plural is breath.
The reasoning being that breath can be used in the plural and the singular as it is an uncountable noun.
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The plural form of the noun congress is congresses.The plural possessive form is congresses'.
The plural form of congressman is congressmen.
Gladioli (actual Latin plural) or gladioluses (Anglicized).
why do we have plural executive
The plural form of the noun governor is governors.The plural possessive form is governors'.Example: The governors' conference will be held in Philadelphia this year.