/θ, ð/ at the beginning of a word

How do we pronounce written TH, /θ, ð/ ?

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Where do we find written th at the beginning of a word?

1)  voiceless /θ/ =
a limited number of content words

2) voiced /ð/ =
function words

3)  1 exception =
thyme /taym/

tongue twister

I thought a thought.
But the thought I thought
wasn’t the thought I thought I thought.

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thought /θɔt/

 

And now it’s your turn.
voiceless /θ/ … voiced /ð/ … irregular /t/?