This might be specific to my current students, but they often confuse these two adjectives, possibly because in their mother tongue there’s one word which means both.
- convenient – something that fits in well with your needs, suitable for you needs
- comfortable – something which makes you feel relaxed, physical ease
My new smart phone is very convenient for me to use – I can use it for many things including making calls, surfing the internet and taking photos.
My new smart phone is very comfortable for me to use – it’s lightweight and fits comfortably in the palm of my hand.
The convenience store is very convenient because it’s open 24 hours and stocks all the essentials. The temperature is always comfortable because they have air conditioning.