We found one dictionary that defines the word pillowiness:

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1. pillowiness: Wiktionary

Definitions from Wiktionary (pillowiness) ▸ noun:  The quality of being pillowy. ▸ Words similar to pillowiness ▸ Usage examples for pillowiness ▸ Idioms related to pillowiness ▸ Wikipedia articles (New!) ▸ Popular adjectives describing pillowiness ▸ Words that often appear near pillowiness ▸ Rhymes of pillowiness ▸ Invented words related to pillowiness