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Seven words put O first and C third, and only one of them is in everyday use. The rest are narrow.
OCCUR is the one word here you would meet in ordinary writing. It is also the only one that doubles the C, which makes it unusually easy to identify.
N takes the second box in three of the seven and R in two. Those two branches hold most of the page, but neither contains a word most people would produce unprompted.
ORCAS is the next most reachable, being the plural of the whale. ONCES and ONCER come off the same stem and both are word game entries rather than everyday vocabulary.
One word on the page repeats a letter and it is OCCUR. If your puzzle shows a double, the answer is settled in one step.
R closes three of the seven, more than any other letter, and E leads the fourth box on three. Both point back toward OCCUR and ONCER.
With seven words there is no percentage worth reading. The practical advice is to try OCCUR first and treat everything after it as a dictionary check.
On this pattern it usually is, simply because the alternatives are uncommon. It is worth playing before working through anything else.
A chemical compound, also written orcinol. It is one of the two words here with R in the second box.
Both appear in word game dictionaries as dialect forms. Neither is something you would write, but both are valid entries on this list.