16 words
Weather and seasons
The safest small talk there is, and the words on every forecast.
天气tiānqìweather
热rèhot
冷lěngcold
暖和nuǎnhuowarm
凉快liángkuaipleasantly cool
下雨xià yǔto rain
下雪xià xuěto snow
刮风guā fēngto be windy
晴天qíngtiāna clear day
阴天yīntiānan overcast day
伞sǎnumbrella
天气预报tiānqì yùbàoweather forecast
春天chūntiānspring
夏天xiàtiānsummer
秋天qiūtiānautumn
冬天dōngtiānwinter
Turn the pinyin off with the switch above and it blurs rather than disappearing. Tap any blurred line to peek at it. That is a better test than hiding it completely, because you find out whether you knew it or only nearly knew it.