The best replacement for trait is state.

The best alternatives to trait are rated as following:
★★★★★  state
★★★  characteristic
★★  disease
★★  state anxiety
★  gene
★  allele
★  behavior
★  sickle cell disease
★  skill
★  type
★  trite
★  situation
★  quality
★  skill leadership
  character
  mixin
  disorder controlled by one gene
  sickle cell anemia
  abstract class
  phenotype
  recessive trait
  personality disorder
  learned behavior
  allele that is masked by a dominant allele
  attribute
  state personality
  feature
  anemia
  inherited trait
  state psychology

Your alternative for trait is not listed? Suggest!
Speaking about trait, one probably shouldn't forget about alpha thalassemia.

Other search terms related to trait and their ratings are:
★★★★★ alpha thalassemia
★★★★ crisis
★★ more than two alleles
You have in mind a companion for trait and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of trait in all years. Click on graph for more.
trait
state
characteristic