Again, this list is not exhaustive. There are many more options. But it is a starting point, and might save you some time.
[col 6 first] [table format=1]
| accelerate | speed up |
| achieve | reach |
| alter | change |
| analyse | examine |
| assist | help |
| attach | join |
| challenge | question |
| claim | suggest |
| clarify | explain |
| concentrate on | focus on |
| confine | limit |
| develop | evolve |
| eliminate | remove |
| evaluate | take apart |
| find | establish |
| maintain | insist |
| predict | forecast |
| prohibit | ban |
| quote | cite |
| rise | increase |
| reduce | decrease |
| respond | reply |
| retain | keep |
| show | demonstrate |
| strengthen | reinforce |