noun
arachnology
The scientific study of spiders and related arachnids. A specialized academic term.
彼は大学でクモ学を専攻している。
He is majoring in arachnology at university.
Entomology, the study of insects, a broader field that sometimes overlaps with arachnology.
Compound of クモ (spider) and 学 (study, -ology).