Maple and Sycamore

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

Sycamore and maple are semantically related. In some cases you can replace term "Sycamore" with "Maple", this nouns are similar.

Sycamore noun - Eurasian maple tree with pale grey bark that peels in flakes like that of a sycamore tree; leaves with five ovate lobes yellow in autumn.

Maple and sycamore are semantically related. You can use "Maple" instead a noun "Sycamore".