Uncountable Nouns That Start with OBS and End with ION

Explore 9 verified English uncountable nouns starting with OBS and ending with ION, including Observation, Obsession, Obstruction, Obscuration, Obstipation, Obsoletion and Obsecration. 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.