Butterfly and Nymphalid

Butterfly noun - Diurnal insect typically having a slender body with knobbed antennae and broad colorful wings.

Nymphalid and butterfly are semantically related. In some cases you can replace term "Nymphalid" with "Butterfly", this nouns are similar.

Nymphalid noun - Medium to large butterflies found worldwide typically having brightly colored wings and much-reduced nonfunctional forelegs carried folded on the breast.

Butterfly and nymphalid are semantically related. You can use "Butterfly" instead a noun "Nymphalid".