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90 sites linking between each other with similar words, how can I profit from WORD ON LINKS without it being spam and black hat?
90 sites interlinking is already spam and black hat... a situation that Google can probably detect.
"WORD ON LINKS", if I understand what you mean by this (ie, links with no anchor text variation), are one more clue to Google that this is a contrived situation.
Both will probably trip filters of various sorts. Depends on the rest of the link profiles of all of these sites... how many other inbounds each has from good sites outside your network... but my guess is the situations isn't healthy enough to obscure these obvious patterns.