Words matter, yes. Some people can use them with eloquence. Some people stumble over them, some people use them as knives to cut others deep and hurt them beyond repair. Some people use them to woo and win friendship, some to destroy a life, with carefully woven lies.
My high school principal gave the entire student body some wise advice some decades ago: Examine the way the mouth is constructed. The tongue is placed behind the lips, behind the teeth, and held in place by a lever beneath it. To speak is not always necessary. Think carefully before you do...
She was an eloquent woman with powerful observation skills. Notice that the eyes don't have so many blocks in front of the lens.
I believe the more eloquent one becomes, the less one will have to say, because I think eloquence is a derivative of knowledge, skills, and abilities. The more one knows, the more one is able to speak with flow. So, I think rather than practice words and try to build a vocabulary by combing the dictionary, we should gain skills, secure knowledge, and develop our abilities. Then we will find that vocabulary and eloquence comes naturally. From a place of knowledge, skills, and abilities, one may choose to speak, or not...depending upon necessity. How pleasant it is to listen to such a person speak.