Similarity adjectives are listed in this post. Each word below can often be found in front of the noun similarity in the same sentence. This reference page can help answer the question what are some adjectives commonly used for describing SIMILARITY.
absolute, accidental, alleged, apparent, astonishing, based, basic, broad, certain, chemical, clear, close, closer, closest, complete
conceptual, considerable, cosine, cultural, curious, distinct, eerie, enough, essential, evident, exact, external, extraordinary, formal, functional
fundamental, further, general, genetic, great, greater, greatest, high, important, interesting, key, less, linguistic, little, marked
mere, more, morphological, much, observed, obvious, only, original, other, outward, overall, partial, perfect, phonetic, physical
possible, qualitative, real, relative, remarkable, same, second, semantic, significant, slight, specific, strange, striking, strong, structural
substantial, such, sufficient, superficial, supposed, surprising, uncanny, underlying, verbal, very, visual, wonderful
Hope this word list had the adjective used with similarity you were looking for. Additional describing words / adjectives that describe / adjectives of various nouns can be found in the other pages on this website.