Another word for massive or huge is ginormous, which is prolly a ginormous surprise to most of us. This adjective has been around since 1942. Merriam-Webster uses it in the sentence, “had a ginormous house with a swimming pool and a pool table.”
Similar to ginormous, according to Merriam-Webster, humongous is also a real, dictionary-approved word. Which, again, is another word pertaining to anything extremely large.
Yes, Merriam-Webster shocks us once again with a whole nother commonly-misperceived-as-wrong word. Also spelled as ‘nother and used as another word for “other,” this word has surprisingly been used since the 14th century.