Maybe the fact that it’s his car makes it memorable enough in this case, but I’m with you… car + roar for a Formula 1 race-car, which is a car so loud you can hear it in your ear. Then add the logic that: the guy with the loudest car will have the best career… and thus link it back to the meaning of the word.
I think it depends on the abstract word in question though… are we talking career (s. above), good (angel), bad (Michael Jackson) or SAT words? The former just being a case of placing an image in your memory palace that is a concrete noun as a stand-in for the actual word but the meaning is known or the latter where you want to memorize new words and their meaning.
Additionally, are we trying to get the spelling right as well… neither car + rear not car + ear would cover that. @cr4zy1w4n are you talking about abstract words like this:
30 atrophy - an aging bodybuilder with “a trophy” from back in the days when he was big. Alternatively, watch a lot of House, MD and you’re familiar with the word anyway.
64 cerebral - via Spanish or X-Men
65 chagrin - via French
66 charlatan - via German Scharlatan
79 concur - google “I concur meme” from Catch me if you can
99 debunk - simply debunking a bunk bed
147 dogmatic - being pragmatic by sending a dog (replace prag-) to automatically convince you of my opinion
191 facile - via French or Spanish
301 nebulous - via German Nebel (eng: mist)… hidden in the mist
327 peevish - old guy getting up at night to pee wishing he had a younger prostate
378 reap - the Grim Reaper collecting souls
…how many of those can you actually work with the word itself like in 30, 99, 378 rather than using the syllables as in 147, 327? Also, if you speak any other languages sometimes you can oftentimes just take that shortcut.