Multiplier onion and Onion plant

Multiplier onion noun - Type of onion plant producing small clustered mild-flavored bulbs used as seasoning.

Onion plant and multiplier onion are semantically related. In some cases you can use "Onion plant" instead a noun phrase "Multiplier onion".

Onion plant noun - Bulbous plant having hollow leaves cultivated worldwide for its rounded edible bulb.

Multiplier onion and onion plant are semantically related. Sometimes you can replace phrase "Multiplier onion" with "Onion plant", this phrases are similar.