Common Words by Reading

てっ
62.5%
thoroughness ②thorough enforcement
to penetrate ②to devote oneself (to) ③to do throughout (e.g. the night)
to (be able to) read between the lines
テツ
32.5%
staying up all night
after staying up all night
accomplishment ②penetration
carrying out one's original intention
playing mahjong all night
stubborn and short-tempered
staunch (steadfast, single-hearted) in one's devotion to his master (lord)
all-night karaoke
clearness (e.g. sky)