mountaintops Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition plural noun. the highest points of mountains. Example Sentence We admired the mountaintops in the distance. Spelled as one word. More Example Sentences We climbed to the mountaintops for views. Synonyms peaks; summits; heights Antonyms valleys; lows; dips Hear It! Say It! Write It! mountaintops Switch to cursive Start Share with your friends: