録音機
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機械(きかい) - machine
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I don’t really think that there is a word that starts with 械… Unless someone can prove me wrong?
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Me neither 
But i can think of something that starts with 機械!
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That’s right!!! Then, what about 機械学習, which means “machine learning”?
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Sounds good to me!
習練 - practice, training
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This question prompted me to do some research. 械闘 and 械繫 come up pretty readily although they only appear in a handful of dictionaries. I then found this post on 知恵袋. As it is probably region blocked for many people I will copy/paste the answer below:
『字通』によれば
【械解】かいかい 押送する。
【械檻】かいかん 加械して収檻する。
【械器】かいき 器物。武器の類。〔管子、国蓄〕千乘の國は、天財の殖する、械の出づる、財物の生ずるを封ず。
【械機】かいき 機心巧智。
【械繫】かいけい 加械して牢に入れる。〔漢書、婁敬伝〕上（しやう）、を怒罵して曰く、齊（婁敬をさす）、舌を以て官を得、乃ち今言して、吾が軍を沮（はば）むと。を廣武に械す。
【械頸】かいけい 首かせ。
【械梏】かいこく かせ。
【械数】かいすう 割符。
【械送】かいそう 押送する。
【械致】かいち 護送する。
【械杻】かいちゆう かせ。（○は木偏に紐の旁）
【械闘】かいとう 凶器をもち群闘する。
【械筏】かいばつ 槍いかだ。
【械用】かいよう 道具。
字通 is gigantic kanji dictionary. These words are almost certainly obsolete. I will check my much smaller kanji dictionary at work tomorrow as it also often has some nice obsolete words in and I wonder if it has any of these ones.
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練度 (れんど)- proficiency, skill
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度胸(どきょう) - courage
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胸襟 - one’s heart
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襟巻 - A weird way to say scarf
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巻き寿司 - Sushi roll (not this kind 
)
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司令(しれい) - commander
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令和 - Reiwa AKA the current era of Japan we’re living in!
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和牛 - Wagyu (Japanese beef)
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牛革 = ぎゅうかわ = cowhide
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革命(かくめい) - revolution
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命運 - Destiny, fate
(Not to be confused with 運命 which is basically the exact same thing hehe 
)
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運命 - Destiny, fate
(Not to be confused with 命運 which is basically the exact same thing hehe )
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