if you know which specific line of the file you need:
echo -a $read(file.txt,nt,specific_number)
if you want to scan for the first line your word appears:
set %text $read(file.txt,ntw,*word*,%starting_line)
The %starting_line is optional parameter that lets you start deeper in the file than line 1. If you want a complete word, you'll need more processing to make sure it didn't find 'sword' or 'wordsmith'. You probably wouldn't want to avoid false matches by having spaces between the asterisks and your searchword, because that wouldn't find when the word was at the start of a line, or touched by a comma, period, quote, etc.
If you want to scan for ALL the lines in a file containing your various words, you can have a loop where you search again starting with $calc($readn +1) until you get nothing.
A faster way to process a text file is to
filter -fw text.txt @window *
to fetch all the lines into the @window, then use $fline to search the window. You can get the text either by:
var %line $fline(@window,1,*wildstring*) to get the line number
var %text $line(@window,%line)
or
var %text $fline(@window,1,*wildstring*).text
