Supposedly is correct. Supposably is incorrect in standard English — it is a common mispronunciation/misspelling of supposedly. Supposedly = according ...

Leech is correct for the blood-sucking worm (and, figuratively, a person who lives off others). Leach is a different word ...

Poky is correct and the standard spelling — it means slow, or (for a horse) slow-moving and lazy. Pokey is ...

Both judgemental and judgmental are correct. Judgmental (without the e) is American English and the more common spelling worldwide; judgemental ...

Both goodbye and good-bye are correct and mean the same thing — a farewell. Goodbye (one word) is the most ...

Tardies is correct. Tardys is incorrect. Tardies is the plural of tardy — tardy becomes tardies (y changes to ies). ...

Both autumn and fall are correct and mean the same season (the season between summer and winter). Autumn is the ...

Teammate (one word) is the most common spelling. Team mate (two words) is also correct and means the same thing ...

Both onward and onwards are correct and mean the same thing — moving forward or continuing from a point in ...