allotrope
noun/ˈæləˌtroʊp/
Frequency rank: #19,985 of 20,003 in the WORDED list (wordfreq data)
Meaning
A distinct physical form in which an element can exist, differing in the arrangement of its atoms.

Example sentence
Diamond and graphite are each a different allotrope of carbon, sharing the same element but with very different structures.
Synonyms & related words
More words in ranks 19,901–20,000
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