THERE ARE languages in which DIFFERENT parts of speach have GENDERS (masculine/feminine/neutral), so that all parts of speach (nouns,verbs,adjectives,adverbs,pronouns,etc.) should receive this feature.
THERE ARE languages in which 3 (three) DIFFERENT numbers (singular/dual/plural) can be found, so that all parts of speach (as previously shown) should receive this feature.
ETC.