Here's how I distinguish the sounds made by various jet engines.
Forward sound: "buzzsaw"
-- This sound is indeed very common in the P&W-powered 762's, in pretty much all 757's, certainly in the early-series 747's, and also on the L1011 and DC-10. But - as Sovietjet pointed out - these are all "fat" or large-diameter turbofans, and so the "buzzsaw" noise is quite deep and guttural. In "slimmer" turbofans, like the JT3D, there is definitely a buzzsaw forward noise - but it's of a much higher pitch than the large, high-bypass engines that I mentioned above. It makes sense to me that turbojets (in other words, "straight-pipe" or no-bypass engines) would not
make a buzzsaw noise, since the first "fan" blades in the intake are part of the compressor, and the overall air intake space is much smaller in turbojets compared to turbofans. It's not to say that there is absolutely none of this noise produced by turbojets - I've never heard them up close - but the few sound files that I have heard of turbojets starting up or taxiing, have had more of a plain "hiss" or air-being-sucked-in sound, with the "fighter-jet" thunder reverberating from behind - in other words, from the very noisy exhaust.
Lateral sound: "scream" or "whistle"
-- The few sound files that I've seen of turbojets in operation (e.g. Comet) have had an intensely painful scream - a kind of shrill whistle, if you will. Now, I have picked this up pretty much in all
jet engines - even the most modern, quiet turbofans. They all have a bit of a whistle as they pass by. The JT3D's that powered the 707 and DC-8 had a particularly resonant, melodious "whine" as they landed - quite the sound. The IL
-62 had a similar kind of sound as well.
Aft sound: "thunder" or "crackle" or "boom"
-- The aft sounds produced by various jet engines can be quite variable. The Concorde had an intense, fighter-jet-like thunder. The JT8D's on the old-generation 737's and DC-9's really crackled (though the hushkitted engines in recent operation now seem to produce more of a "muffled hiss", if I can use another term). I never heard the aft sound of a JT4A with sound suppressors, so this I don't know. But most high-bypass fans today seem to cover up the "boom" of the hot jet exhaust quite well with the cool air.
May the wind be always at your back . . . except during takeoff & landing.