What is another word for put in a good word?
Pronunciation: [pˌʊt ɪn ɐ ɡˈʊd wˈɜːd] (IPA) 
When you want to speak kindly about someone to others, you can use several synonyms for "put in a good word." You can recommend someone, speak highly of them, praise them, endorse them, vouch for them, or give them a good reference. Other alternatives include extolling their virtues, commending them, lauding them, championing them, advocating for them, and supporting them. Choosing the right synonym depends on the situation and the degree of emphasis you want to place on your recommendation. Whatever your choice, remember that putting in a good word for someone can go a long way in helping them succeed.
