While most Spanish nouns follow standard rules to form the plural (adding -s or -es), there are several important exceptions and specific usage patterns you need to know to speak like a native.
If a noun ends in -s (or -x) and the stress falls on any syllable except the last one (an unstressed final syllable), the noun itself does not change in the plural. Instead, the article indicates the plurality.
Note: This rule applies to most days of the week (lunes, martes, miércoles, jueves, viernes).
When a compound noun is formed by two distinct nouns written separately, typically only the first noun takes the plural form. The second noun remains distinct and singular because it functions like an adjective describing the first noun.
Some nouns in Spanish are used exclusively or predominantly in the plural form, even if they refer to a single object (similar to "scissors" or "pants" in English).
This is a very common difference between English and Spanish. When referring to parts of the body, personal hygiene items, or clothing belonging to multiple people, Spanish typically uses the singular noun if each person has only one of that item.
English often uses the plural ("They wash their faces"), but Spanish logic is: "Each person washes their own (one) face."
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