Er
Er noun - A trivalent metallic element of the rare earth group; occurs with yttrium.
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Whoop and Er. (2016). Retrieved 2026, July 29, from https://thesaurus.plus/related/er/whoop
Er & Whoop. N.p., 2016. Web. 29 Jul. 2026. <https://thesaurus.plus/related/er/whoop>.
Whoop or Er. 2016. Accessed July 29, 2026. https://thesaurus.plus/related/er/whoop.
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