Yes, the word 'playpen' is a compound noun.
A compound word is a word made of two or more individual words that merge to form a word with a meaning of its own.
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Upwards is a compound word.
Upstairs is a compound word, so it is one word.
A non compound word is , a word with one word not two . For a example a compound word is snowflake. An non compound is hot cheetos.
No, the word ability is not a compound word.