Job 27:18 New English Translation

¹⁸The house he builds is as fragile as a moth’s cocoon,^[a]
like a hut^[b] that a watchman has made.

Job 27:18 tn Heb כָעָשׁ (khaʿash, “like a moth”), but this leaves room for clarification. Some commentators wanted to change it to “bird’s nest” or just “nest” (cf. NRSV) to make the parallelism; see Job 4:14. But the word is not found. The LXX has a double expression, “as moths, as a spider.” So several take it as the spider’s web, which is certainly unsubstantial (cf. NAB, NASB, NLT; see Job 8:14).
Job 27:18 tn The Hebrew word is the word for “booth,” as in the Feast of Booths. The word describes something that is flimsy; it is not substantial at all.

New English Translation (NET)