Achene and Key fruit

Achene noun - Small dry indehiscent fruit with the seed distinct from the fruit wall.

Key fruit and achene are semantically related. In some cases you can replace phrase "Key fruit" with "Achene", this terms are similar.

Key fruit noun - A winged often one-seed indehiscent fruit as of the ash or elm or maple.

Achene and key fruit are semantically related. You can use "Achene" instead a noun phrase "Key fruit".