| Share | Phrase |
|---|
| 85.49% | nitrous [similarity] oxide |
| 4.05% | nitrous [similarity] acid |
| 3.54% | nitrous [similarity] emission |
| 1.58% | nitrous [similarity] gas |
| 1.43% | nitrous [similarity] conduit |
| 1.42% | nitrous [similarity] solution |
| 1.30% | nitrous [similarity] system |
| 1.17% | nitrous [similarity] mixture |