what is countable word

Countable and uncountable nouns. Nouns can be either countable or uncountable. Countable nouns (or count nouns) are those that refer to something that can be counted. They have both singular and plural forms (e.g. cat/cats; woman/women; country/countries). ... Uncountable nouns can't be preceded by a or an.

a)person, animals, plants etc.. example ( friend, horse, bird,rose) b) objects having shape. example ( ball, car,hat,hand,house etc) c) the individual parts of a mass. example (part,element, atom, piece, drop etc)