Maple and Swamp maple

Maple noun - Any of numerous trees or shrubs of the genus Acer bearing winged seeds in pairs; north temperate zone.

Swamp maple and maple are semantically related. In some cases you can replace phrase "Swamp maple" with "Maple", this terms are similar.

Swamp maple noun - Maple of eastern and central America; five-lobed leaves turn scarlet and yellow in autumn.

Maple and swamp maple are semantically related. You can use "Maple" instead a noun phrase "Swamp maple".