The phrase "passive words" typically refers to a type of vocabulary that is used to describe actions or events, rather than being an active participant in the action. Full definition
When you describe a task or accomplishment, avoid passive words like, was responsible for. (livecareer.com)
Avoid passive words and phrases, and convince the employer that you are the best person for the job. (careerimpressions.ca)
The keyboard also uses a familiar passive word - prediction system whereby you're given a choice of possible words while you type, and you can simply tap to insert them. (techradar.com)