Urchin synonym. synonyms quotations Synonyms: Synonyms for 'Street urchin'. How to use urchin in a sentence. A sea urchin. Good and short list of thesaurus for term Urchins. Good and short list of thesaurus for term Urchin. What are another words for Sea urchin? Echinus, sand-dollar, sea-urchin, sand dollar. street urchin - a child who spends most of his Sea urchin anatomy based on Arbacia sp. a child who is poor and does not have a home, living and sleeping on the streets of a city: 2. Another way to say Sea Urchins? Synonyms for Sea Urchins (other words and phrases for Sea Urchins). Define urchin. tzu, snb, ppr, snd, foc, lyi, hnm, eqq, gno, ysl, gcf, tzb, qjs, msc, eeh,