Looking up the pronunciations in M-W, I find a lot of options on these. Glacier can be pronounced with either SH or ZH, or if you’re British, an S. Glazier can be pronounced with either ZH or Z. Personally, I use SH and Z, so they aren’t an SH/ZH pair in my dialect.
ETA: this is the best one so far. Neither are obscure or capitalized.
Interestingly, there’s a near-miss that covers both: vision - fission.
This isn’t perfect, though, since “dilution” is often pronounced with a long I (/aɪ/ in IPA) rather than a schwa.
Ravel and raffle. But aren’t the final sounds in batch and badge fricatives too?
BTW, in my dialect, off and of have different vowels as do often and oven. The first of each pair is aw and the second is uh.
Another minimal pair for “th” occurred to me today, after doing The NY Times crossword. It involves slang: “thou” (as in the pronoun) and “thou” as in slang for “thousand.”
They are affricates. There is a stop just before the fricative. ‘Batch’ without the stop is ‘bash’.