Collocations for reader - noun

careful, competent, fast, fluent, good, proficient
poor, slow
alert, astute, attentive, eagle-eyed, observant
Alert readers may have noticed the misprint in last week's column.

interested
The book is accessible to the interested reader with basic knowledge of the subject.

reluctant
discerning, informed, knowledgeable, sophisticated
uninformed
avid, great, voracious
omnivorous
faithful, long-time (esp. AmE), loyal, regular
regular readers of this magazine

casual
adult, female, male, women, young
specialist
general, lay, non-specialist
a book that will be too difficult for the general reader

newspaper, tabloid (esp. BrE)
Newsweek, Times, etc.

reader of
a voracious reader of science fiction

dear reader (humorous)
And so, dear reader, our tale comes to its end.