The term 'LACKING RAIN' can be described by three words: DRY (3 letters), SERE (4 letters), and ARID (4 letters). DRY is an adjective that means having no moisture or not wet. SERE is an adjective that means DRY, withered, or parched. ARID is an adjective that means extremely DRY, especially due to lack of rain. All three words describe a situation where there is a lack of rain, which can lead to drought-like conditions.