In English there are no masculine or feminine forms. English uses gender specific nouns for male or female, such as male and female.
The noun 'guide' is a common gender noun, a word for a male or a female.
devoir (noun) is a masculine word in French.
The word guide is a noun; a word for one who guides. The noun form of the verb "to guide" is guidance.
Un meurtre (masculine noun)
le lait (masculine noun)
un raporteur (masculine noun)
Un serpent (masculine noun)
un chameau: masculine noun.
Un piano (masculine noun)
'un fait' (masculine noun)
The word "diccionarios" is a masculine noun in Spanish.
"un album" is a masculine noun in French.
un zèbre (masculine noun)