Bath chair and Wheelchair

Bath chair noun - A wheelchair usually pushed by an attendant, as at a spa.

Wheelchair and bath chair are semantically related. In some cases you can use "Wheelchair" instead a noun phrase "Bath chair".

Wheelchair noun - A movable chair mounted on large wheels; for invalids or those who cannot walk; frequently propelled by the occupant.

Bath chair and wheelchair are semantically related. Sometimes you can replace phrase "Bath chair" with "Wheelchair", this terms are similar.