The Chinese word for insect is
昆虫

kūnchóng

Translations for insect and their definitions

蟲子
1. n. insect; worm; bug
我見過guo 的蟲子zi 有毛máor毛maor蟲chóngr、蚯蚓、西瓜蟲chóngr、蜘蛛、蜈蚣gong，還有螞蟻。 - The insects and worms I have seen are caterpillar, earthworm, pill bug, spider, centipede and ant., M-UIB

虫子
1. Simplified form of 蟲子

蟲
1. insect; bug
倮蟲 - creature without covering (i.e., hairless, featherless, scaleless, shellless), the category that humans belong to in Chinese folk taxonomy
爬蟲 - reptile
2. person who indulges in something
懶蟲 - lazy fellow
網蟲 - netizen
3. (obsolete, of insect) to bite; to eat
4. Alternative form of 爞