Hindi · Pronunciation Guide
thuh-KAA — the th is an aspirated dental stop, tongue on the teeth with a puff of air, never the th of "thin."
thakaa
One puff-heavy light syllable feeding a long-vowelled one, so the beat is at the end. The aspiration on थ adds so much audible time to the front of the word that learners often mistake it for a stressed syllable; it is not, it is just breathy.
Listen: थका
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मैं आज रात बहुत थका हूँ।
Maiṁ aaj raat bahut thakaa hooṁ.
I am very tired tonight.
Listen: मैं आज रात बहुत थका हूँ।
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"Maiṁ aaj raat bahut thakaa hooṁ" uses the masculine thakaa; a woman would say thakee, changing the final vowel. Raat before it ends in a dental त with no aspiration, so the sentence puts an unaspirated and an aspirated dental within two words of each other.
Almost everyone reads th as the fricative in "thanks" and produces a sound Hindi does not have at all. The airflow must stop completely first. The mirror error is aspirating the second consonant instead — the puff belongs to थ and the क must stay dry.