Countable Nouns Ending in CAL and Containing IO

Explore 6 verified English countable nouns ending in CAL and containing IO, including Biological, Periodical, Biochemical, Radiopharmaceutical, Radiochemical and Semiochemical. Browse these count nouns with singular and plural forms below, or review singular and plural count rules in our noun grammar guide.

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Starts with B
2 words
biological
biochemical
Starts with P
1 words
periodical
Starts with R
2 words
radiopharmaceutical
radiochemical
Starts with S
1 words
semiochemical

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