The term 'TINY, INFORMALLY' can be expressed in two different ways. The first is 'EENSY, ' which is a 5-letter word. This word is derived from the phrase 'eeny meeny miny moe, ' which is used to count or choose between two or more options. The second way to express this term is 'ITSY, ' which is a 4-letter word. This word is derived from the phrase 'itsy bitsy spider, ' which is a popular nursery rhyme. Both of these words are used to describe something that is very small.