Top side and Topside

Top side noun - The highest or uppermost side of anything.

Topside and top side are semantically related. in exterior topic. In some cases you can use "Topside" instead the phrase "Top side" as a noun or an adjective or an adverb.

Topside noun - (usually plural) weather deck; the part of a ship's hull that is above the waterline.

Top side and topside are semantically related. Sometimes you can replace phrase "Top side" with "Topside", this terms are similar.