opus44,
тоды for
<p id="word"></p>
<script>
var q1='[{"id":"8","en_word":"Head","transcription":"hed ","ru_word":"\u0413\u043e\u043b\u043e\u0432\u0430"},{"id":"9","en_word":"Word","transcription":"w\u025c\u02d0d","ru_word":"\u0421\u043b\u043e\u0432\u043e"}]',
data=JSON.parse(q1),
keys = [];
for(var key in data) keys.push(data[key]["en_word"]);
(function getWord(){
document.getElementById("word").innerHTML = keys.shift();
keys.length && setTimeout(getWord, 10000);
})()
</script>