1. Fish organ
2. Lung
3. Breathing organ
4. Respiratory organ
5. Air bladder
6. Respiratory cavity
7. Vent
8. Gill slit
9. Branchial arch
10. Branchial cleft
11. Branchial chamber
12. Branchial pouch
13. Branchial basket
14. Branchial basket chamber
15. Branchial basket pouch
16. Branchial groove
17. Branchial furrow
18. Branchial plate
19. Branchial ridge
20. Branchial slit
21. Branchial opening
22. Branchial aperture
23. Branchial pore
24. Branchial chamber slit
25. Branchial chamber opening
26. Branchial chamber aperture
27. Branchial chamber pore
28. Branchial chamber groove
29. Branchial chamber furrow
30. Branchial chamber ridge

If you’re looking for other words for gill, you’ve come to the right place. Here we have compiled a list of 30 synonyms for the word gill. These range from fish organ, lung, and breathing organ to more specific terms such as branchial arch, branchial cleft, and branchial chamber. Whether you’re looking for the best ideas or just need another word for gill, this list of synonyms should have you covered.