Countable Nouns That Start with AP and End with X

Explore 5 verified English countable nouns starting with AP and ending with X, including Appendix, Apex, Apoplex, Apteryx and Aphanapteryx. Sort these count nouns with singular and plural forms by word length for ESL grammar practice, determiner usage, and plural spelling below, or review singular and plural count rules in our noun grammar guide.