twin·set or twin set 
(twĭnsĕt)
(twĭnsĕt)n.
A sweater set consisting of a cardigan and a shell or pullover that match and are worn together.
- biomagnetism
- biomagnification
- biomarker
- biomass
- biomaterial
- biomathematical
- biomathematician
- biomathematics
- biome
- biomechanical
- biomechanically
- biomechanics
- biomedical
- biomedical engineering
- biomedicine
- biometeorology
- biometric
- biometrical
- biometrically
- biometrics
- biometry
- biomorph
- biomorphic
- biomorphism
- bionic