grammar.nouns.compound-nouns
Compound nouns: el abrelatas, el sacacorchos
Verb + plural noun makes a masculine, invariable compound: el abrelatas, el paraguas, el lavaplatos. Noun + noun compounds pluralize the first word: hombres rana.
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Explanation
The productive pattern is verb + noun: abrir + latas → el abrelatas ('can opener'), also sacacorchos, parabrisas, cumpleaños, rascacielos. They're masculine and identical in singular and plural: el/los paraguas.
Noun + noun or noun + adjective pairs inflect on the head: el hombre rana → los hombres rana, la palabra clave → las palabras clave.
Examples
El lavaplatos no funciona.
The dishwasher isn't working.
The dishwasher isn't working.
Region: global
Definimos las palabras clave del proyecto.
We defined the project's keywords.
We defined the project's keywords.
Region: global