Term Life as the name states covers you for your selected term. It can be for 5, 10 20 even till you are age 99. Term plans are relatively cheaper than whole life plans because they don't take on as much risk as life plans and don't accumulate cash values. The sum assured remains the same since inception
Life Plans covers you for life, thus costing you more. You may not be sick or disabled, but surely you will die and surely insurer must pay. Usually such a plan participate with company earnings in a way to beat inflation over the years and also create a surrender value (to entice you to surrender). You die, insurer pays more.
Different companies have different products and pricing. The contractual part in the contract also differs from one company to another. Currently, a good insurer with good life contract (with early CI) and best sum assured per dollar is Tokio Marine. No other insurer dare share otherwise.