We found one dictionary that defines the word underroom:

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1. underroom: Wiktionary

Definitions from Wiktionary (underroom) ▸ noun:  A room below ground. ▸ Words similar to underroom ▸ Usage examples for underroom ▸ Idioms related to underroom ▸ Wikipedia articles (New!) ▸ Popular adjectives describing underroom ▸ Words that often appear near underroom ▸ Rhymes of underroom ▸ Invented words related to underroom