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)
un chameau: masculine noun.
le lait (masculine noun)
un raporteur (masculine noun)
Un serpent (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 livre" is a masculine noun in French.