FYI, it looks like we have a significant number of "Av" instances in primary waypoint labels that should be "Ave", most of which are in Mississippi, Alabama, and South Carolina. Mississippi and Alabama are not surprising, as those are on US routes plotted well before the current guidelines were developed, and those states have not yet undergone the review that would precede the development of their state systems. There are all kinds of problems there.
Here are the ones in places other than Mississippi and Alabama:
+---------+-------------+------------+-------------+-----------------+
| 323296 | JewAv | 32.475204 | -93.797265 | la.us079 |
| 323300 | LinAv | 32.494615 | -93.760822 | la.us079 |
| 323653 | JewAv | 32.475204 | -93.797265 | la.us080 |
| 323657 | LinAv | 32.494615 | -93.760822 | la.us080 |
| 733941 | 1stAv | 36.876239 | -94.877565 | ok.us066hismia |
| 727978 | HenAv | 34.820196 | -82.414596 | sc.sc020 |
| 728163 | ECamAv | 34.170787 | -82.080072 | sc.sc034 |
| 728251 | 9thAv | 34.420063 | -79.377709 | sc.sc034 |
| 728306 | AllAv | 33.393111 | -81.434564 | sc.sc039 |
| 728414 | GenFraMarAv | 33.439181 | -80.087713 | sc.sc045 |
| 728599 | CalAv | 34.974531 | -81.957895 | sc.sc056 |
| 728807 | LauAv | 34.216395 | -82.15742 | sc.sc072 |
| 728858 | CamAv | 34.195313 | -82.161626 | sc.sc072busgre |
| 728894 | MarAv | 34.210148 | -82.647734 | sc.sc081 |
| 729221 | OakAv | 34.929272 | -81.023597 | sc.sc122 |
| 729228 | LoiAv | 34.847454 | -82.429783 | sc.sc124 |
| 729387 | ECarAv | 34.375222 | -80.070902 | sc.sc151bushar |
| 729492 | AshAv | 32.65545 | -79.940761 | sc.sc171 |
| 729565 | WStoAv | 34.861259 | -82.406895 | sc.sc183 |
| 729720 | GarAv | 33.016497 | -80.855058 | sc.sc212 |
| 730255 | GarAv | 33.050009 | -80.873255 | sc.sc362 |
| 730288 | McCorAv | 34.662273 | -79.540052 | sc.sc381 |
| 730601 | LeeAv | 32.854094 | -80.011138 | sc.sc642 |
| 730634 | 41stAv | 32.797883 | -79.758117 | sc.sc703 |
| 730714 | SHerAv | 34.951506 | -81.062148 | sc.sc901 |
| 342449 | StChaAv | 38.038923 | -78.467359 | va.us250 |
| 342450 | StClaAv | 38.037148 | -78.464291 | va.us250 |
| 353081 | FaiAv | 39.195858 | -78.165262 | va.us522 |
| 502159 | 7thAv | 37.203996 | -77.45386 | va.va319alb |
| 354300 | ClaAv | 44.716185 | -108.864641 | wy.us014altpow |
+---------+-------------+------------+-------------+-----------------+
It looks like SC has a few directional prefixes that are generally discouraged.