- Opt Verb
- Opt in Verb
- Opt out Verb
- Optant Noun Adj
- Optate Verb
- Optation Noun
- Optative Adj Noun
- Opthalmic Adj
- Optic Adj Noun
- Optical Adj
- Optically Adv
- Optician Noun
- Opticist Noun
- Opticity Noun
- Opticochiasmal Adj
- Opticochiasmatic Adj
- Opticociliary Adj
- Opticoencephalitis Noun
- Opticofacial Adj
- Opticohemiplegic Adj Noun
- Opticospectral Adj
- Optimal Adj
- Optimality Noun
- Optimally Adv
- Optimate Noun Adj
- Optimeter Noun Adj
- Optimisation Noun Adj
- Optimise Verb
- Optimised Adj Past Participle
- Optimism Noun
- Optimist Noun
- Optimistic Adj
- Optimistical Adj
- Optimistically Adv
- Optimization Noun Adj
- Optimize Verb
- Optimized Adj
- Optimizer Noun Adj
- Optimum Adj Noun
- Option Noun Verb Adj
- Optional Adj Noun
- Optionality Noun
- Optionally Adv
- Optionee Noun
- Optioner Noun
- Optionor Noun Adj
- Optoacoustic Adj
- Optocoupler Noun Adj
- Optoelecronic
- Optoelectronic Adj
- Optoelectronics Noun
- Optogalvanic Adj
- Optogram Noun Adj
- Optoisolation Noun Adj
- Optoisolator Noun Adj
- Optokinetic Adj
- Optomechanical Adj
- Optometer Noun Adj
- Optometric Adj
- Optometrical Adj