Questões comentadas . Concursos Diversos de Formação de Palavras (Prefixos e Sufixos) | Word Formation (Prefix and Suffix) | 222839

The expressions:

• rock hard, soft boiled, melting point

are combinations of words that function together as a single unit with a specific meaning, often formed by two or more words.

✅ These are compounds.

• Antonyms → words with opposite meanings (not the case here)
• Idioms → fixed expressions with figurative meaning (not exactly here)
• Contrastive stress → spoken emphasis (irrelevant)
• Lexical sets → groups of words in the same semantic field (too broad)

✅ Correct answer: a) Compounds