compound noun
US /ˈkɑːmpaʊnd naʊn/
UK /ˈkɑːmpaʊnd naʊn/

1.
substantivo composto
a noun made up of two or more words, which may be written as one word, as two hyphenated words, or as two separate words
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The word 'sunflower' is a compound noun.
A palavra 'girassol' é um substantivo composto.
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'High school' is an example of a compound noun written as two separate words.
'High school' é um exemplo de substantivo composto escrito como duas palavras separadas.