variola

noun 0.718

vaccinia

noun 0.612

varicella

noun 0.581

smallpox

noun 0.564

cowpox

noun 0.555

variegation

noun 0.546

vaccination

noun 0.538

poxvirus

noun 0.517

biovar

noun 0.508

varietal

noun 0.505

variorum

noun 0.503

variation

noun 0.500