Summer squash and Zucchini

Summer squash noun - Any of various usually bushy plants producing fruit that is eaten while immature and before the rind or seeds harden.

Zucchini and summer squash are semantically related. In some cases you can use "Zucchini" instead a noun phrase "Summer squash".

Zucchini noun - Small cucumber-shaped vegetable marrow; typically dark green.

Summer squash and zucchini are semantically related. You can use "Summer squash" instead a noun "Zucchini".