Noun stacking is when several nouns get piled up in a row, all modifying one final noun at the end — common in technical, corporate, and academic writing, and almost always harder to read than it needs to be.
English normally signals how words relate to each other with small connecting words — prepositions, articles, verbs. Stacking nouns strips all of that out, so the reader has to guess the relationships between the words themselves. Is it a "data migration project" or a "migration project timeline" or a "customer account data" thing? Technically the phrase resolves eventually, but only after the reader does extra work that a few small words would have done automatically.
Pick the core noun the whole phrase is actually about (usually the last one), and rebuild the phrase around it using prepositions ("of," "for," "in") or a verb form to reconnect the pieces:
Two-noun combinations are extremely common and cause no confusion — "customer service," "data migration," "project timeline" are all perfectly normal. The problem only shows up once you're stacking three or more, especially in technical or corporate writing where it's easy to keep tacking on another qualifier without noticing the phrase has become a wall of nouns.
If a phrase has three or more nouns in a row before the word it's all modifying, try reading it as if explaining it out loud to someone. However you'd naturally say it — with "for," "of," "that," or a verb — is usually the fix.
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