Word Type

Noun

The word "actinium" can be used as a noun.

Word Relationships

Derived Terms

actinate actinide actiniferous actinium A actinium B actinium C actinium emanation actinium fluoride actinium series actinium-K eka-actinium protactinium radioactinium

Broader Terms (Hypernyms)

chemical element element

Type Of (IsA)

chemical element radioactive substance unalloyed metal

Related Terms

actinism actino actinoid actinon

Related Terms

ac actinism actino actinoid actinon atomic number chemical element metallic ore radioactive uranium

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.