Synonyms of the word 
COMMODIOUSNESS → BIGNESS - CAPACIOUSNESS - LARGENESS - ROOMINESS - SPACIOUSNESS
commodiousness
- n. The state or quality of being commodious.
bigness
- n. The characteristic of being big.
- n. (obsolete) Size.
capaciousness
- n. The quality of being capacious.
largeness
- n. (obsolete) Liberality; generosity.
- n. The property of being physically large.
- n. The quality of not being limited or constrained; having great scope.
roominess
- n. The quality of being roomy.
spaciousness
- n. The state or quality of being spacious.
If you are interested in words, visit the following sites :
- wiktionary.org/commodiousness For complete definition of a word
- 1word.ws/commodiousness to play with words, suffixs, prefixs, etc.