Lecture
Try to say something to a lifeguard and you'll just end up getting a lecture.
A lifeguard's favorite part of the job is telling people what to do, where to swim, when to get out of the water, and they love saying it in a bunch of words.
こう
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This lecture loving lifeguard is none other than こういち! I mean, look how long winded the stuff on this site is? Can you imagine him trying to give you a talk about proper swimming etiquette?
Close your eyes and picture こういち lecturing you. Ugh, it's the worst! Hint: when you see the "lifeguard" radical, the reading is probably going to be こう.