Uncountable Nouns That Start with OP and End with ESS

Explore 16 verified English uncountable nouns starting with OP and ending with ESS, including Openness, Openmindedness, Opaqueness, Oppressiveness, Openendedness, Openheartedness and Oppositeness. Sort these mass nouns and non-count terms for substances and concepts by word length for quantifier accuracy, academic writing, and ESL study below, or check quantifier and measurement rules in our noun grammar guide.

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Starts with OPA
1 words
opaqueness
Starts with OPE8 words
openness
openmindedness
openendedness
openheartedness
openhandedness
operativeness
openmouthedness
operoseness
Starts with OPI
2 words
opinionativeness
opinionatedness
Starts with OPP4 words
oppressiveness
oppositeness
opportuneness
opprobriousness
Starts with OPT
1 words
optimisticalness

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