/θ/ and /ð/

We often pronounce as /θ/ in -th	We often pronounce as /ð/ in -the
thanks, theater, theme, thing, think, thirst, thought, thousand, threat, Thursday bath, beneath, birth, breath, death, earth, worth, healthy, lengthy, strength, wealthy anything, nothing, everything, athlete, author, ethnic, method	than, that, their, these, though although, another, together, either, neither, other, whether, worthy bother, clothing, father, further, gather, Netherlands, southern, northern, weather

These words can be pronounced in both ways: with, without, within