Dipteran and Insect

Dipteran 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.

Insect and dipteran are semantically related. In some cases you can use "Insect" instead a noun "Dipteran".

Insect noun - A person of no importance or influence.

Dipteran and insect are semantically related. Sometimes you can replace term "Dipteran" with "Insect", this nouns are similar.