Crane fly and Dipterous insect

Crane fly noun - Long-legged slender flies that resemble large mosquitoes but do not bite.

Dipterous insect and crane fly are semantically related. In some cases you can use "Dipterous insect" instead a noun phrase "Crane fly".

Dipterous insect noun - Insects having usually a single pair of functional wings (anterior pair) with the posterior pair reduced to small knobbed structures and mouth parts adapted for sucking or lapping or piercing.

Crane fly and dipterous insect are semantically related. Sometimes you can replace phrase "Crane fly" with "Dipterous insect", this phrases are similar.