Dictionary.com Thesaurus.com

split-level vs. bi-level

split-level

[split-lev-uhl] / ˈsplɪtˈlɛv əl /

adjective

noting a house having a room or rooms that are somewhat above or below adjacent rooms, with the floor levels usually differing by approximately half a story.

noun

a split-level house.

bi-level

[bahy-lev-uhl] / baɪˈlɛv əl /

adjective

having two levels of space, as a railroad passenger car with two tiers of seats.
(especially of a house) split-level.

noun

a bi-level house, vehicle, etc..

The family moved from a bungalow into a bi-level.