Larry Sievers garnered a lot of attention as a 2-time consensus AA during the mid-'70s. Even though his expected NFL success never materialized, he was followed into the league by another great UT WR who played for a decade-and-a-half: Stanley Morgan.
The '80s saw a whole slew of UT WRs who were taken in the first round of the NFL draft: Anthony Hancock, Willie Gault, Clyde Duncan, Tim McGee, Anthony Miller and Alvin Harper (in '91). During this time, other UT WRs (who were NOT 1st rounders) went on to significant NFL careers that solidified the image of UT as WR U. These included guys who weren't considered to be greats, like Sam Graddy, and guys who exceeded expectations, like Carl Pickens. The NFL seemed to be full of Vol WRs.
By the time guys like Peerless Price, Robert Meachem and Donte Stallworth came along, other schools were making a case to be considered WR U. But in the '80s, UT was pretty much undisputed. And we can still make a pretty good argument today.
And that's even if you exclude TEs, which would leave out David Martin and Jason Witten.