Today’s topic is quite challenging since the differences are subtle. To help you memorize these two words meaning, read and analyze a lot of sample sentence until you can easily distinguish them.
And there is also the irregularity with ‘hairu’ which sometimes read as ‘iru’ in some sentence/phrase. It was said that the original reading was ‘iru’ but then evolved into ‘hairu’. But somehow the ‘iru’ reading still survive in some cases and thus create the irregularity.
Happy Learning ｡ﾟ✶ฺ.ヽ(*´∀`*)ﾉ.✶ฺﾟ｡